[SOLVED] Simple RSS Feed -widget gives large font with Atahualpa 3.7.9

Also with the 'old' one.
On my site I installed and use the Simple RSS Feed-widget to show some stuff, but unfortunately the feed-entries show up with a very large font. If I use the Twenty-Eleven-theme it looks like the way I would like, but with Atahualpa not.
For an example see http://blog.dickpluim.com and on the left site at the bottom you can see what I mean.

Another thing: everytime I update the theme I have to copy the pictures from the header back as they always get overwritten (when updating from within WP).

Thanx in advance.